Obstructive sensation or dull pain behind the sternum when swallowing dry food is one of the early and middle stage manifestations of esophageal cancer. It is mainly progressive dysphagia, and in the early stage, there may be only discomfort or blockage feeling when swallowing, pain behind the sternum or discomfort behind the sternum when swallowing food. People often think that esophageal cancer is not a serious disease, although it belongs to a kind of cancer, but it is also very harmful. To confirm the diagnosis of esophageal cancer, the following methods can be adopted for diagnosis, such as esophageal exfoliative cytology examination; barium meal X-ray imaging; fiberoptic endoscopy; CT scan of the chest; esophageal endoscopic ultrasonography. It has been proved through practice that it is practical and feasible to conduct large area census in the high incidence area of esophageal cancer, and the total positive rate can reach more than 90%. Early diagnosis of esophageal cancer is not easy to show. Experienced radiologists fully adjust the barium, make the patient swallow it in small mouths, and carefully observe in multiple directions and double air-barium imaging, most of them can find the signs of earlier cancer such as thickened esophageal mucosa, tortuous or dashed interruption; or hairy esophageal edge; or small filling defect; or small niche shadow; or limited stiffness of canal wall; or barium retention. Endoscopic manifestation and typing of early esophageal cancer: 1. Plaque type: mostly focal, gray-white, slightly above the mucosal surface. The surface is rough or erosion, sometimes complicated by tiny cancerous nodules or small sand-like particles. 2.Small nodule type: It appears as isolated or multiple small nodules, and the surface is easy to break up and bleed. These single or multiple nodules may occasionally leave the main foci to form satellite lesions, which may constitute a multi-point source of early cancer. 3.Incognito type: In a few other cases, there is no obvious morphological change in esophageal mucosa. 4.Celiac type: the most common type, accounting for more than 50% of early esophageal cancer, with local congestion, loss of normal luster of mucosa and clear boundary around the lesion. The erosion area is coarse and granular, and the mucosa is wrinkled or accompanied by single or multiple small nodules. 5.Rough type: part of esophageal mucosa is rough and then thickened and irregular, losing normal appearance.